iseries Managing disk units

Transcription

1 iseries Managing disk units

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3 iseries Managing disk units

4 Copyright International Business Machines Corporation All rights reserved. US Government Users Restricted Rights Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

5 Contents Managing disk units in disk pools Planning for disk management Accessing Disk Units in Operations Navigator Accessing your iseries server from your PC Choosing the right procedure for configuring disks Calculating disk pool space requirements Task 1: Calculating the current storage used Task 2: Calculating storage needed Using the graphical view Managing disk unit configuration Adding a disk unit or disk pool Maintaining disk unit configuration Protecting data on disk units Working with device parity protection Working with mirrored protection Optimizing disk unit performance Managing data in independent disk pools Making a tower switchable or private Making a disk pool available or unavailable Recovering an independent disk pool Copyright IBM Corp iii

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7 Managing disk units in disk pools Managing your disk units is a straightforward process with the help of Operations Navigator. Operations Navigator implements a graphical view so you can see exactly where your disk units are located and obtain configuration information about each one. Operations Navigator offers several wizards that simplify the processes of installing a disk unit, adding a disk unit to a disk pool, replacing a disk unit, and creating a new disk pool. A disk pool is an auxiliary storage pool (ASP) that contains only disk units. A disk pool allows you to consolidate related information on groups of disk units for recovery, availability, and performance reasons. A disk pool is a software definition of how the disk units are arranged. It does not necessarily correspond to the physical placement of disk units in the server. Once you have your disk pools and disk units configured, you can use Operations Navigator to customize and maintain disk unit performance. Operations Navigator also gives you the ability to manage independent disk pools to ensure your information is continuously available. To learn more about the disk management possibilities available to you, see the following topics: Note: In this topic the word tower is used to refer to an expansion unit, a feature that can be connected to a system unit to provide additional storage and processing capacity. Planning for disk management Before you start, make sure you can access Disk Units in Operations Navigator as well as the iseries server through the service tools server. Also, find the right procedural checklist and a table to help calculate space needed to perform actions in disk pools. Finally, learn how the graphical view helps you plan and configure disk units. Managing disk unit configuration Find out how easy it is to combine several disk configuration procedures into one with the Add Disk Unit and New Disk Pool wizards. Learn how to move, remove, and replace disk units to suit your needs. Also, find out how to delete or clear disk pool data. Protecting data on disk units Learn to protect your data with device parity protection and mirrored protection through Operations Navigator. Optimizing disk unit performance Find out how preventing disk pool overflow, enabling automatic overflow recovery, balancing disk pools, and starting disk compression can contribute to more efficient data management. Managing data in independent disk pools Learn how to create a switchable or dedicated independent disk pool. Find out how to make towers switchable and disk pools available. Also, learn how to recover an independent disk pool. The topics listed above give you an overview of disk management using Operations Navigator. If you need more information, consult Backup and Recovery or Operations Navigator online help for disk units. Planning for disk management Changing the disk configuration of your server is a time-consuming process, so you want to plan carefully to be as efficient as possible. Before you begin disk management using Operations Navigator, go through this short list to ensure you are ready. Copyright IBM Corp

8 1. Install the Configuration and Service component of Operations Navigator so that you can access Disk Units. 2. Make sure you can access your server from your PC in order to do disk management functions. 3. Find the right disk unit configuration checklist to use during your procedures. 4. Check your disk pool space requirements. 5. Evaluate the current configuration of the server and plan your strategy using the graphical view window in Operations Navigator. Return to Managing disk units in disk pools. Accessing Disk Units in Operations Navigator Before you can perform any disk management tasks with Operations Navigator, you need to install the Configuration and Service component and enable the Disk Units container. Follow these steps in order to access the Disk Units container: Install the Configuration and Service component 1. From the File menu of Operations Navigator select Selective Setup. 2. Follow the wizard instructions to install the Configuration and Service component. Enable the Disk Units container 1. In Operations Navigator right-click the server connection and select Application Administration. 2. On the resulting window, click OK. 3. Click the Host Applications tab. 4. Expand Operating System/ Expand Service. 6. Select Disk Units to have Default Access or All Object Access. 7. Click OK. 8. Restart Operations Navigator. Access the Disk Unit container to perform all disk management functions 1. In Operations Navigator, expand My Connections (or your active environment). 2. Expand any iseries server. 3. Expand Configuration and Service. 4. Expand Hardware. 5. Expand Disk Units. When you reach this point, you are ready to perform disk management tasks. Return to Planning for disk management for more planning steps. Accessing your iseries server from your PC Operations Navigator allows you to access the iseries server from your PC through the service tools server (STS) to perform disk management functions at two different levels. You can access the iseries server when it is fully restarted, or you can access the server when it is in dedicated service tools (DST) mode. DST provides some additional functions for disk management that are not available when the server is fully restarted. Before you attempt to use any disk management functions, you must configure the service tools server. If you want to access DST functions, you must also set a service IP address. Configuring the service tools server 2 iseries: Managing disk units

9 In order to access disk management functions in Operations Navigator, you must first configure the service tools server (STS) with DST access and user profiles. For instructions to configure the service tools server, refer to the Managing Service Tools section of the Tips for Managing and Monitoring Authority chapter in Tips and Tools. Setting the service IP address In order to access DST functions on your server from Operations Navigator, you will need to specify a service IP address for the server. The service IP address specifies the TCP/IP address of the service system that the current physical system uses. This address takes the form xxx.xxx.xxx.xxx where xxx is an integer from 0 to 255. The address can also be a Domain Name System (DNS) that resolves to an address as described above. Contact your network administrator for this information. To set the service IP address for your system, follow these steps: 1. In Operations Navigator, expand My Connections (or your active environment). 2. Right-click the server for which you want to specify a service IP address, and select Properties. 3. Click the Service tab. 4. Enter the service IP address and click OK to enact the changes. Once the service IP address is set, you can connect to the system when it is in DST mode by using Operations Navigator. Simply start Operations Navigator as you normally would to connect to the system. Operations Navigator will open with a subset of functions that you can perform in DST. Return to Planning for disk management for more planning steps. Choosing the right procedure for configuring disks This article contains several checklists for performing configuration procedures. Use this table to determine which checklist to use for your situation. Task description Procedure to follow Requires DST? Configure your system for the first time. Checklist 1 Yes Add one or more disk units that will not have device parity protection. This checklist applies to disk units that are capable of device parity protection if you do not plan to start device parity protection for the disks. Add one or more disks to an existing 9337 Disk Array Subsystem if you plan to protect the disks with device parity protection. Use this checklist if device parity protection is already started for the 9337 Disk Array Subsystem. Add one or more disks to an existing Input/Output Processor (IOP) that has built-in device parity capability. Use this checklist if you plan to protect some or all of the new disks with device parity protection. Add a new IOP that has built-in device parity capability. Use this checklist if you plan to protect some or all of the new disks with device parity protection. Checklist 2 Checklist 3 Checklist 4 Checklist 5 No No No Yes Move disk units between existing disk pools without mirrored protection. Checklist 6 Yes Move disk units between existing ASPs with mirrored protection. Checklist 7 Yes Delete a basic disk pool. Checklist 8 Yes Remove one or more disk units without device parity protection. Checklist 9 Yes 1 Remove one or more disk units from a 9337 Disk Array Subsystem. Use this checklist if device parity protection is started for some or all of the disks in the 9337 Disk Array Subsystem and they are in disk pools without mirrored protection. Checklist 10 Yes Managing disk units in disk pools 3

10 Remove one or more disk units from a 9337 Disk Array Subsystem. Use this checklist if device parity protection is started for some or all of the disks in the 9337 Disk Array Subsystem and they are in disk pools with mirrored protection. Remove one or more disk units from an IOP. Use this checklist if device parity protection is started for some or all of the disk units that are attached to the IOP and they are in disk pools without mirrored protection. Remove one or more disk units from an IOP. Use this checklist if device parity protection is started for some or all of the disks units that are attached to the IOP and they are in disk pools with mirrored protection. Checklist 11 Checklist 12 Checklist 13 1 Unassigned disk units can be removed from offline independent disk pools without requiring the system to be in DST mode. Yes Yes Yes Checklist 1: Configuring disks on a new system This checklist shows the sequence of tasks that you use to configure disks on a new iseries server. Whether you need to perform all the tasks depends on the disk protection that you want on your system. Setting up disk protection for your data provides more information about the disk protection that is available. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Check off the configuration tasks as you perform them. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include references to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your disk configuration. Currently, all of your disk units except the load source unit appear as nonconfigured. Using the graphical view Use the Add Disk Unit wizard to add nonconfigured disks to the correct disk pools. You will have the option to start device parity protection or to start compression, if disks are available for these actions. The default storage threshold for each disk pool is 90%. Change to a different storage threshold for any disk pool, if desired. If you chose to create protected disk pools and included pairs of disk units to be mirrored, you may want to restart to dedicated service tools (DST) level and start mirroring for those disk pools now. Using the Add Disk Unit and New Disk Pool wizards Setting the disk pool threshold Working with mirroring 5. If you started mirrored protection for the system disk pool or a basic disk pool, wait until your system completely restarts. 6. Verify that your disk configuration is correct. Using the graphical view 7. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery 4 iseries: Managing disk units

11 Checklist 2: Adding disk units without device parity protection This checklist shows the sequence of tasks that you use to configure disks on a new iseries server. Whether you need to perform all the tasks depends on the disk protection that you want on your system. Setting up disk protection for your data provides more information about the disk protection that is available. Adding to a disk pool with mirrored protection You can add disk units to a disk pool that has mirrored protection without stopping and starting mirrored protection. You must add disk units in pairs with equal capacities. The added units will always be paired with each other. You may want to choose a later time, when your system can be unavailable for several hours, to stop and start mirrored protection. When you start mirrored protection again, the system evaluates the pairing for all disk units on your system. This may provide a higher level of availability for failures that affect a controller, an IOP, or a bus. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Check off the configuration tasks as you perform them. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include references to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Use the graphical view to find empty slots for the Using the graphical view disk units you want to install. 2. Right-click an empty slot and start the Install Disk Unit wizard to guide you through the process. 3. Use the Add Disk Unit wizard to add nonconfigured disks to existing or new disk pools. You will have the option to start compression or to add disk units of equal capacity to mirror protected disk pools if disks are available for these actions. Using the Add Disk Unit and New Disk Pool wizards The default storage threshold for each disk pool is 90%. Change to a different storage threshold for any disk pool if desired. If you chose to create protected disk pools and you included pairs of disk units to be mirrored, you may want to restart to the dedicated service tools (DST) level and start mirroring for those disk pools now. Setting the disk pool threshold Working with mirroring 6. If you started mirrored protection for the system disk pool or a basic disk pool, wait until your system completely restarts. 7. Verify that your disk configuration is correct. Using the graphical view 8. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 3: Adding disk units to a 9337 disk array subsystem This checklist shows the sequence of tasks that you use to add one or more disks to an existing 9337 Disk Array Subsystem. Use this checklist if you plan to protect the new disk units with device parity protection. Managing disk units in disk pools 5

12 Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you or the service representative perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Physically attach disk units using the Install Disk Using the graphical view Unit wizard available in the graphical view. 2. Use the Add Disk Unit wizard to add nonconfigured disks to the correct disk pools. Take the option to Using the Add Disk Unit and New Disk Pool wizards include disk units in a parity set. 3. The default storage threshold for each disk pool is 90%. If you want a different storage threshold for any disk pool, change it. Setting the disk pool threshold 4. Verify that your disk configuration is correct. Using the graphical view 5. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 4: Adding disk units to an existing input/output processor This checklist shows the sequence of tasks that you use to add one or more disks to an existing Input/Output Processor that has built-in device parity protection. Use this checklist if you plan to protect some or all of the new disk units with device parity protection. If you do not plan to protect any of the new disk units, use checklist 2. You can use this procedure whether or not you have mirrored protection on your system because you start device parity protection before you add the disk units to a disk pool. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you or the service representative perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include link to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Physically attach disk units using the Install Disk Using the graphical view Unit wizard available in the graphical view. 2. Use the Add Disk Unit wizard to add nonconfigured disks to the correct disk pools. The wizard will allow you to include the disk units that you want to protect in device parity protection Using the Add Disk Unit and New Disk Pool wizards 6 iseries: Managing disk units

13 3. The default storage threshold for each disk pool is 90%. If you want a different storage threshold for any disk pool, change it. Setting the disk pool threshold 4. Verify that your disk configuration is correct. Using the graphical view 5. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 5: Adding a new input/output processor This checklist shows the sequence of tasks that you use to add a new Input/Output Processor (IOP) and disk units to your system. Use this checklist if you plan to protect some or all of the new disks with device parity protection.you can use this procedure whether or not you have mirrored protection on your system because you start device parity protection before you add the disk units to a disk pool. If you do have mirrored protection and you are adding disks that do not have device parity protection, you must add them in pairs that have equal capacities. Note: If you do not plan to start device parity protection for any of the new disks, use the procedure in checklist 2 to add them. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you or the service representative perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. The following are the basic rules for starting protection for IOPs that support device parity protection: v Maximum number of parity sets allowed: 2 v Maximum number of devices per parity set: 10 v Minimum number of devices per parity set: 4 v All devices in a parity set must be the same capacity v The protection supports 66xx devices, not 61xx devices in parity sets or devices that use the write cache support. v You must remove 66xx Model 30 devices from the disk pool configuration before you start device parity protection. This allows the system to reformat the disk for the advanced functions of the IOP. After you start device parity protection, add the disk to the ASP configuration. Task What to do Where to learn more Install the new input/output processor in the server. This is normally done by a service representative. Physically attach disk units to the new IOP using the Install Disk Unit wizard which you can access from the Graphical View. Use the Add Disk Unit wizard to add nonconfigured disks to the correct disk pools. Take the option to start device parity protection. The default storage threshold for each disk pool is 90%. If you want a different storage threshold for any disk pool, change it. Using the graphical view Using the graphical view Using the Add Disk Unit and New Disk Pool wizards Setting the disk pool threshold Managing disk units in disk pools 7

14 5. You may want to restart to the dedicated service tools (DST) level in order for the device parity protection to take effect. Working with device parity protection 6. Wait until your system completely restarts. 7. Verify that your disk configuration is correct. Using the Graphical View 8. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 6: Moving disk units between non-mirrored disk pools This checklist shows the sequence of tasks that you use to move one or more disk units from one basic disk pool to another basic disk pool. Use these tasks when you do not have mirrored protection active for the disk pools. You must restart your server to DST mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for both the Calculating disk pool space requirements source and target disk pools for the disk units. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. From the graphical view window, right-click the disk Maintaining disk unit configuration unit you want to move and select Move. 6. Verify that your disk configuration in correct. Using the graphical view 7. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery 8. Restart your server. Checklist 7: Moving disk units between mirrored disk pools This checklist shows the sequence of tasks that you use to move one or more disk units from one basic disk pool to another basic disk pool. Use these tasks when one or more of the disk pools involved in the move has mirrored protection. You cannot use the move disk unit procedure when mirrored protection is active. Instead, you remove mirrored pairs from the source disk pool and add them to the target disk pool. You must restart your server to Dedicated Service Tools (DST) mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. 8 iseries: Managing disk units

15 Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the Graphical View 2. Calculate the space requirements for both the Calculating disk pool space requirements source and target disk pools for the disk units. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. In the graphical view, filter by Mirrored Pair, then hold the Ctrl key until you have selected each disk unit of the mirrored pair. Right-click one of the selected disk units and select Remove. Maintaining disk unit configuration Add nonconfigured disk units to the correct disk pools. If you are adding disk units to a protected disk pool and the new disk units do not have device parity protection, you must add pairs of disk units that have identical capacities. If you created a new disk pool when you added disk units, the system set the storage threshold of the disk pool to 90%. If you want a different storage threshold for any disk pool, change it. If you created any new disk pools and you want those disk pools to have mirrored protection, start mirrored protection now. Adding disk units Setting the disk pool threshold Working with mirroring 9. Verify that your disk unit configuration is correct. Using the graphical view 10. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 8: Deleting a disk pool This checklist shows the sequence of tasks that you use to delete a basic or independent disk pool. If you want to delete or clear an independent disk pool that is unavailable, you can do so when your system is fully restarted. For all other disk pools, you will need to restart your system to DST before clearing or deleting them. Attention:Make sure that you have completely saved your system in the event that you need to recover from an error situation. Also note that when a disk pool is deleted, all data remaining in that disk pool is lost. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more Managing disk units in disk pools 9

16 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the remaining Calculating disk pool space requirements disk pools. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Remove objects from the disk pool that you are deleting or move the objects to a different disk pool. Backup and Recovery manual Restart your server to dedicated service tools (DST) mode. Delete the disk pool. This procedure places all of the disks that were assigned to the deleted disk pool in nonconfigured status. If you want to add the now nonconfigured disk units to a different disk pool, refer to Checklist 2 or 3. Maintaining disk unit configuration Checklist 2 or Checklist 3 8. Verify that your disk unit configuration is correct. Using the graphical view 9. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery 10. Restart your server. Checklist 9: Removing disk units without device parity protection This checklist shows the sequence of tasks that you use to remove one or more disk units from your system when the disk units do not have device parity protection. Use these tasks when you are permanently removing disk units from your system. Do not use these tasks when you are repairing or replacing a failed disk unit. You must restart your server to dedicated service tools (DST) mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the disk pools Calculating disk pool space requirements that are involved in disk removal. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. Remove disk units that you plan to remove from Maintaining disk unit configuration the system. 6. Verify that your disk unit configuration is correct. Using the graphical view 10 iseries: Managing disk units

17 7. 8. Print a hard copy of your disk configuration to have in case of a recovery situation. Continue restarting your server. Backup and Recovery Checklist 10: Removing disk units with device parity protection (9337) from a disk pool without mirrored protection This checklist shows the sequence of tasks that you use to remove one or more disk units from a 9337 Disk Array Subsystem. Use these steps when device parity protection is active for the 9337 Disk Array Subsystem and when the disk pools containing the disk units do not have mirrored protection. Use these tasks when you are permanently removing disk units from your system. Do not use these tasks when you are repairing or replacing a failed disk unit. You must restart your server to dedicated service tools (DST) mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you or the service representative perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the disk pools Calculating disk pool space requirements that are involved in disk removal. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. Remove disk units that you plan to remove from Maintaining disk unit configuration the system. 6. Exclude the disk units from device parity protection Working with device parity protection in the Verify that your disk unit configuration is correct. Using the graphical view 8. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery 9. Restart your server. Checklist 11: Removing disk units that have device parity protection (9337) from a disk pool with mirrored protection This checklist shows the sequence of tasks that you use to remove one or more disk units from a 9337 Disk Array Subsystem. These tasks apply when the disk pools containing the disk units have mirrored protection and when device parity protection is active for the 9337 Disk Array Subsystem. Use these tasks when you are permanently removing disk units from your system. Do not use these tasks when you are repairing or replacing a failed disk unit. You must restart your server to dedicated service tools (DST) mode to perform the tasks in this checklist. Managing disk units in disk pools 11

18 Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the disk pools Calculating disk pool space requirements that are involved in disk removal. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. Remove disk units that you plan to remove from Maintaining disk unit configuration the system. 6. Stop mirrored protection for the disk pools that will have disk units removed. When you stop mirrored protection, one disk unit from each mirrored pair becomes nonconfigured. You need to stop mirrored protection only if the disk pool contains other disk units that are attached to the 9337 Disk Array Subsystem and have device parity protection. Working with mirroring Exclude the disk units from the The service representative can perform the exclude function on the Add nonconfigured disk units to the correct disk pools. These disk units became nonconfigured when you stopped mirrored protection in task 6. Adding disk units to a disk pool 9. Start mirrored protection for the disk pools that had Working with mirroring mirrored protection stopped in task Verify that your disk unit configuration is correct. Using the graphical view 11. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Checklist 12: Removing disk units that have device parity protection from a disk pool without mirrored protection This checklist shows the sequence of tasks that you use to remove one or more disk units from an Input/Output Processor with built-in device parity protection. These tasks apply when the disk pools containing the disk units do not have mirrored protection and when device parity protection is started for the IOP. Use these tasks when you are permanently removing disk units from your system. Do not use these tasks when your are repairing or replacing a failed hard disk. You must restart your server to Dedicated Service Tools (DST) mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. 12 iseries: Managing disk units

19 Before you begin, make a copy of this checklist. Fill in the appropriate areas as you or the service representative perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics. Refer to these topics if you need more information about how to perform a particular task. Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the disk pools Calculating disk pool space requirements that are involved in disk removal. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. Remove disk units that you plan to remove from Maintaining disk unit configuration the system. 6. Exclude the disk units from device parity protection. If you were successful in excluding the disk units, skip to task 8. Otherwise, continue to task 7. Working with device parity protection Stop device parity protection for all the disk units in the IOP. Physically remove disk units. If you stopped device parity protection in task 7, then continue with task 9. If you did not stop device parity protection, then skip to task 10. Working with device parity protection Maintaining disk unit configuration 9. Start device parity protection again. Working with device parity protection 10. Verify that your disk unit configuration is correct. Using the graphical view 11. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery 12. Restart your server. Checklist 13: Removing disk units that have device parity protection from a disk pool with mirrored protection This checklist shows the sequence of tasks that you use to remove one or more disk units from an Input/Output Processor that is capable of device parity protection. These tasks apply when the disk pools that contain the disk units have mirrored protection and when the disk units have device parity protection. Use these tasks when your are permanently removing disk units from your system. Do not use these tasks when you are repairing or replacing a failed disk unit. You must restart your server to the dedicated service tools (DST) mode to perform the tasks in this checklist. Attention: When you perform the tasks in this checklist, the system moves large amounts of data. Make sure that you have completely saved your system in the event that you need to recover from an error situation. Before you begin, make a copy of this checklist. Fill in the appropriate areas as you perform the configuration tasks. This checklist provides an important record of your actions. It may help you diagnose any problems that occur. Most tasks in the checklist include links to other topics in this article. Refer to these topics if you need more information about how to perform a particular task. Managing disk units in disk pools 13

20 Task What to do Where to learn more 1. Display your current disk configuration. Using the graphical view 2. Calculate the space requirements for the disk pools Calculating disk pool space requirements that are involved in disk removal. 3. Use option 21 from the Save menu to save your Saving your server with the GO SAVE command entire system. 4. Restart your server to dedicated service tools (DST) mode. 5. Remove disk units that you plan to remove from Maintaining disk unit configuration the system. 6. Exclude the disk units from device parity protection. If you were successful in excluding the disk units, skip to task 9. Otherwise, continue to task 7. Working with device parity protection 7. Stop mirrored protection for the disk pools that will have disk units removed. When you stop mirrored protection, one disk unit from each mirrored pair becomes nonconfigured. You need to stop mirrored protection only if the disk pool contains other disk units that are attached to the IOP and have device parity protection. Working with mirroring 8. Stop device parity protection for all the disk units in Working with device parity protection the IOP. 9. Physically remove disk units. This is normally done by a service representative. If you stopped device parity protection in task 8, then continue with task 10. If you did not stop device parity protection, then skip to task Start device parity protection again. Working with device parity protection 11. Add nonconfigured disk units to the correct disk pools. These disk units became nonconfigured when you stopped mirrored protection in task 7. Adding disk units to a disk pool 12. If you created a new disk pool on your system when you added disk units, the system set the storage threshold of the disk pool to 90%. If you want a different storage threshold for any disk pool, change it. Setting the disk pool threshold 13. Start mirrored protection for the disk pools that had Working with Mirroring mirrored protection stopped in task Verify that your disk unit configuration is correct. Using the graphical view 15. Print a hard copy of your disk configuration to have in case of a recovery situation. Backup and Recovery Calculating disk pool space requirements When you are planning to make changes to the disk configuration or the disk protection on your system, you need to calculate the space requirements for the change before you begin. You want to ensure that your system has sufficient disk storage for the changes. Below is an example of a worksheet that you can use to calculate your requirements. The following topics describe the steps for completing the worksheet. 14 iseries: Managing disk units

21 Worksheet for calculating disk pool capacity Type of storage Current storage Interim storage Final storage Disk pool: 1 Total used Total capacity Percent used Disk pool: 2 Total Total capacity Percent used Task 1: Calculating the current storage used Follow these steps to determine how your current system configuration uses the disk capacity. 1. In Operations Navigator, expand Disk Units. 2. Expand Disk Pools. 3. Right-click the source disk pool for which you want to determine space requirements. 4. Select the Capacity tab. The Capacity tab shows you the used space, free space, total capacity, and percentage used. You can also use Management Central to monitor disk usage and disk storage on your servers. On the disk pool capacity worksheet record the following values. 1. Record the total used space. This example uses 1.82 GB (where GB equals bytes). 2. Record the total capacity of the disk pool. This example uses 3.8 GB. 3. Record the percent used. This example uses 47%. Example 1: Calculating disk pool capacity Type of storage Current storage Interim storage Final storage Disk pool: 1 Total used 1.82 GB Total capacity 3.8 GB Percent used 47% Task 2: Calculating storage needed Some changes that you make to your disk configuration require work space on the system. For example, if you move a disk unit from one disk pool to another, the system must copy the information from the disk unit to the other disk units in the source disk pool. Refer to Example 2 and do the following steps to determine the amount of interim space required by the system for this procedure. Fill in the worksheet as you go: 1. From the disk pool display for your source disk pool, determine the disk unit capacities for those you plan to move. The disk units in the example have capacities of.7 GB and 1.1 GB..7 GB GB = 1.8 GB Managing disk units in disk pools 15

22 2. Subtract the total from step 1 from the total capacity of the disk pool: 3.8 GB GB = 2.0 GB 3. Determine what the interim-percent-used amount will be. Divide the total used storage by the amount from step GB / 2.0 GB = 91% used 4. Estimate the amount of data that you will move from the source disk pool to the target disk pool. For example, if you plan to move a library you would use one of the following: v The DSPLIB LIB (library-name) OUTPUT(*PRINT) command v The QLIRLIBD API 5. Subtract the amount in step 4 from the total storage used for the source disk pool. Add it to the target disk pool. For purposes of this example, assume you are moving several large libraries whose size totals 200 MB GB -.2 GB = 1.62 GB Final storage capacity used Example 2: Calculating disk pool capacity Type of storage Current storage Interim storage Final storage Disk pool: 1 Total used 1.82 GB 1.82 GB 1.62 GB Total capacity 3.8 GB 2.0 GB 2.0 GB Percent used 47% 91% 81% Disk pool: 2 Total used 200 MB Total capacity 1.8 GB Percent used 10.88% Using the graphical view Before you change the disk configuration of your server, it is important to know exactly where the existing disk units are located in relation to disk pools, I/O processors, and towers. The graphical view of Operations Navigator eliminates the painstaking process of compiling all this information. The graphical view shows you a graphic of how your server is configured. You can choose to view the information by disk units, by disk pools, by tower, or by I/O processor. You can right-click a particular disk unit or disk pool to obtain a list of its properties. Properties include such things as serial numbers, the storage capacity used, type of protection, and the disk pool threshold. You can also perform actions from within the graphical view. If you right-click a disk unit, you can select from a list of actions to perform. For example, you can start or stop compression on the disk unit, include the disk unit in a parity set, and suspend or resume mirroring if the disk unit has mirrored protection. If you right-click an empty disk unit slot, you can start the Install Disk Unit wizard. To activate the graphical view, follow these steps: 1. In Operations Navigator, expand Disk Units. 2. Right-click All Disk Units, and select Graphical View. 16 iseries: Managing disk units

23 Figure 1: Example of the Graphical View in Operations Navigator. The View by drop-down menu lists several options for viewing disk units. To find more information about the graphical view, consult the online help for disk units. Return to Managing disk units in disk pools. Managing disk unit configuration The Add Disk Unit and New Disk Pool wizards simplify the process of initially configuring your disk units. As your storage needs change you can use Operations Navigator to move, remove, and replace disk units. The interface also allows you to clear or delete disk pools when you no longer need the information categorized in that way. As a part of maintenance you can also rename, format, or scan disk units. Managing disk units in disk pools 17

24 Note: Before changing the disk configuration of your server, you should have already read Planning for disk management. Planning is necessary to determine which procedural checklist to use and to calculate disk pool space requirements. To learn about adding disk units and disk pools as well as maintaining disk unit configuration see the following: v Adding disk units or disk pools v Maintaining disk unit configuration Return to Managing disk units in disk pools. Adding a disk unit or disk pool The Add Disk Unit and New Disk Pool wizards save you time by bundling several time-consuming configuration functions into one efficient process. They also take the guesswork out of disk unit configuration because they understand the capabilities of your system and only offer valid choices. For instance, the wizard will not list the option to start compression unless your server has that capability. Both the Add Disk Unit and New Disk Pool wizards allow you to create a basic or independent disk pool or to use an existing disk pool to add new or nonconfigured disk units. When you choose to add disk units to a protected disk pool, the wizard forces you to include the disk units in device parity protection or to add enough disk units of the same capacity to start mirrored pair protection. The wizard also gives you the option of balancing data across the disk pool or starting disk compression if these are permissible actions for your system configuration. You decide which options to choose so that the operation is tailored to your system. Note: Before changing the disk configuration of your server, you should have already read Planning for disk management. Planning is necessary to determine which procedural checklist to use and to calculate disk pool space requirements. To use the Add Disk Unit and New Disk Pool wizards, follow these simple steps: 1. In Operations Navigator, expand Disk Units. 2. To add disk units, right-click All Disk Units and select Add Disk Unit. 3. To create a new disk pool, right-click Disk Pools and select New Disk Pool. 4. Follow the instructions in the wizard to complete the task. Return to Managing disk unit configuration. Maintaining disk unit configuration Operations Navigator gives you the flexibility to move disk units to other disk pools or replace a failed disk unit in an existing disk pool. You can delete a disk pool or clear data from a disk pool. You can also rename, format, and scan disk units. Note: Before changing the disk configuration of your server, you should have already read Planning for disk management. Planning is necessary to determine which procedural checklist to use and to calculate disk pool space requirements. Moving and removing disk units As your storage needs change, you can select to move a disk unit from one disk pool to another disk pool. When you move a disk unit, the server first moves all of the data on that disk unit to other disk units in the original disk pool. You cannot move disk units to or from an independent disk pool. For disk units in system and basic disk pools, you need to restart your system to dedicated service tools (DST) mode before moving them. 18 iseries: Managing disk units